JPS5639426A - Cavitation detection method and its device - Google Patents

Cavitation detection method and its device

Info

Publication number
JPS5639426A
JPS5639426A JP11411279A JP11411279A JPS5639426A JP S5639426 A JPS5639426 A JP S5639426A JP 11411279 A JP11411279 A JP 11411279A JP 11411279 A JP11411279 A JP 11411279A JP S5639426 A JPS5639426 A JP S5639426A
Authority
JP
Japan
Prior art keywords
circuit
cavitation
level
counter circuit
inputted
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP11411279A
Other languages
Japanese (ja)
Inventor
Yoshiyuki Kamikawa
Tsukasa Nagatomo
Satoru Morikawa
Heiichi Tanaka
Keisuke Tanimoto
Haruki Azuma
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kobe Steel Ltd
Original Assignee
Kobe Steel Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kobe Steel Ltd filed Critical Kobe Steel Ltd
Priority to JP11411279A priority Critical patent/JPS5639426A/en
Publication of JPS5639426A publication Critical patent/JPS5639426A/en
Pending legal-status Critical Current

Links

Landscapes

  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)

Abstract

PURPOSE: To detect a generation of cavitation early and with accuracy by detecting an abnormal phenomenom as a change in the level of electric signal and obtaining the frequency of generations of this level change per unit time.
CONSTITUTION: Pressure fluctuations on the discharge side of the pump are detected by a detector 1 as electric signals. These signals are then transmitted to the absolute value averaging circuit 3 through an amplifier 2 of the output from the absolute value averaging circuit 3 only the wave form larger than the preset level is pulse-shaped by the wave-form comparison shaping circuit 4 and then is input to the counter circuit 5. When the number of pulses per unit time n which are inputted to the counter circuit 5 has reached N, an alarm command signal is inputted to the alarm circuit 6. Under this constitution, it is possible to detect the generation of cavitation with a simple means at an early time with accuracy by properly selecting the set value N of the counter circuit 5.
COPYRIGHT: (C)1981,JPO&Japio
JP11411279A 1979-09-07 1979-09-07 Cavitation detection method and its device Pending JPS5639426A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11411279A JPS5639426A (en) 1979-09-07 1979-09-07 Cavitation detection method and its device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11411279A JPS5639426A (en) 1979-09-07 1979-09-07 Cavitation detection method and its device

Publications (1)

Publication Number Publication Date
JPS5639426A true JPS5639426A (en) 1981-04-15

Family

ID=14629422

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11411279A Pending JPS5639426A (en) 1979-09-07 1979-09-07 Cavitation detection method and its device

Country Status (1)

Country Link
JP (1) JPS5639426A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4580601B2 (en) * 2001-09-21 2010-11-17 東京電力株式会社 Cavitation diagnostic equipment for hydroelectric power generation equipment
JP2017223672A (en) * 2016-06-13 2017-12-21 有限会社カワムラ Gas lock detector in pump unit

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5177905A (en) * 1974-12-27 1976-07-06 Tokyo Shibaura Electric Co DENJIHON PUSOCHI

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5177905A (en) * 1974-12-27 1976-07-06 Tokyo Shibaura Electric Co DENJIHON PUSOCHI

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4580601B2 (en) * 2001-09-21 2010-11-17 東京電力株式会社 Cavitation diagnostic equipment for hydroelectric power generation equipment
JP2017223672A (en) * 2016-06-13 2017-12-21 有限会社カワムラ Gas lock detector in pump unit

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